B. Kessler. Proceedings of the seventh conference on European chapter of the
Association for Computational Linguistics, 1971, page 60--66. Morgan Kaufmann Publishers Inc., (1995)
J. Kessler, M. Eckert, L. Clark, and N. Nicolov. 4th Int'l AAAI Conference on Weblogs and Social Media Data Workshop Challenge (ICWSM-DWC 2010), (2010)